Manjari Nathan, M.D.
NPI 1033386503ActiveIndividual· Internal Medicine, Pulmonary Disease· Walnut Creek, CA
Internal Medicine, Pulmonary Disease (M.D.) with Inpatient Specialists of California PC and 1 other group, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $713,427 for 1,088 claims, against $225,128 paid for services in 2024. Medical Device Business Services, Inc. was the largest of 13 companies reporting payments in 2025, $2,607 in all, mostly food and beverage. Lists Contra Costa Regional Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1033386503 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 13, 2008 |
| Last updated in NPPES | Mar 3, 2025 |
| Certified by provider | Mar 3, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | A80974 | CA |
| Internal Medicine, Sleep Medicine | 207RS0012X | A80974 | CA |
| Internal Medicine, Critical Care Medicine | 207RC0200X | A80974 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Pulmonary Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 507 |
|---|---|
| Services billed | 1,955 across 53 procedure codes |
| Paid by Medicare | $225,128 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,088 · 1,391 30-day fills |
|---|---|
| Patients | 157 |
| Total drug cost | $713,427 |
| Generic share | 39% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Critical Care (Intensivists), Sleep Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Inpatient Specialists of California PCOakdale, CA · 385 clinicians
- Bass Medical GroupChico, CA · 291 clinicians
Hospital affiliations
- Contra Costa Regional Medical CenterMartinez, CA
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$2,607 · 65 payments from 13 companies
- 2024$936.50 · 46 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medical Device Business Services, Inc. | $1,029 | 6 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $392.04 | 15 |
| Astrazeneca Pharmaceuticals LP | $361.65 | 18 |
| Inspire Medical Systems, Inc. | $203.95 | 2 |
| Genzyme Corporation | $151.85 | 6 |
What the 2025 payments were for
- Food and Beverage$1,559 · 60 payments
- Travel and Lodging$929.41 · 3 payments
- Education$118.69 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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